[Solved] Why am I not getting the remainder for “m”?

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There are many ways to do this, this is the one closest to your own code:

#include <stdio.h>

int main() {

    int y, m;

    printf("Input number of months: ");
    fflush(stdout);
    scanf("%d", &y);
    m = y % 12;
    y = y / 12;

    printf(" %i Year(s) \n %i Month(s)" , y, m);
    return 0;
}

The key issue is that you updated the value of y before m had a chance to look at it. Note the order of your y=... and m=.... If you do y=y/12 first, that would update y‘s value to the number of years and the remainder information is lost at this step and m would always be 0. By getting m from the y that’s from the user’s input first, you avoid that issue.

Another minor issue is that there is no need to cast the value from y/12 to be int since you are assigning that value to y which is of type int in the first place. Same applies to when you calculate m, where a typo is also present.

As for the use of fflush, you can refer to this question for details. Compile your code with/without this line to see the difference.

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solved Why am I not getting the remainder for “m”?